OOLITIC AMMONITES. 
81 
requisite to decide whether A. tor qua t us lie really distinct • 
from A. hiplex. 
Mr. Sowerby, in his' description of the figured specimens 
from Cutch, states that they are distinct from “ a Himalayan 
species,” in having an “ incurved inner margin.” On com¬ 
parison of the specimens, I can, however, detect no such 
difference, nor, indeed, any other than that the Himalayan 
specimens have uniformly more numerous (about 55) ribs 
than those from Cuteh, which have about 45. 
• « 
c • * « : 
AMMONITES SCRIPTUS.-S^ac/^, MSS. 
r- 
Plate 16, figs. 2 a-c. 
A. testa discoidea, compressa, tuberculata, costata. Anfractibus 
rotundatis, vix complanatis, circa umbilicum tuberculis mammsefor- 
mibus coronatis, e quibus costa3 bina) oriunt. Costis valde depressis, 
antrorsum areuatis, apud medium anfractus bi fur cat is, ad marginem 
obsoletis. Umbilico magno. Apertura semi-elliptica. 
Diameter of fragmentary wliorl 1*5 in. Spiral ratio .5:3 
Thickness. 1*3 „ Immersion of whorls ... $ 
Thickness.£ 
t c 
A discoid form, with whorls nearly as thick as broad, 
rounded ventrally, and somewhat flattened at the sides; 
ornamented along the umbilicus with a row of about 20 
depressed rounded tubercles, from which spring pairs of ribs, 
also but little developed, and which curve forward across the 
whorls, bifurcating about half-way between the tubercles and 
the periphery, where they become nearly obsolete. The 
sutures (fig. 2 c) are 5-lobed on each side, the ventral lobe 
as broad as, or broader than the adjoining saddles. These 
saddles are rounded, and symmetrically divided. The superior 
lateral lobe is sub-symmetrical and trifurcate. 
A. scriptus is nearly allied to A. gnttatus but is distin¬ 
guished by its more compressed form, as well as by the regular 
bifurcation of its ribs, and some differences in the details of the 
sutures. The only specimen in the collection is the fragment 
figured. 
VOL. II. M 
